Add ID column to GeoJSON file

What you can do is insert a Counter transformer before the writer, it will simply number each feature coming through with an incremental number and you can write that to an attribute. Don't forget to add the attribute to your GeoJSON writer though! (in the User Attributes tab of the writer feature type properties).

Would it be possible to share a small example of what you currently have and what you want to have?

Ah, I see. I think you can't do that under the GeoJSON specs, from what I've been able to find out you can only have type, geometry and properties at the features level. The FME writer will add all attributes at the properties level.

Hi, I didnt manage to add the id where I wanted it. I ended up opening the geojson file in QGIS and exported it with an id that way, although this way it is difficult to automate.

Hi,

I had the same problem and this is how I solved it with python:

Create the geojson file with a FeatureWriter. In the summary output port you get the output path as "_dataset" attribute. Connect a PythonCaller to the summary output port and add the following code in the input function:

import json
import os
[...]
def input(self, feature):
    filename = feature.getAttribute('_dataset')
    with open(filename, 'r', encoding='utf8') as file:
        data = json.load(file)
        for f in data["features"]:
            f["id"] = f["properties"]["id"]
 
    os.remove(filename)
    with open(filename, 'w', encoding='utf8') as f:
        json.dump(data, f, ensure_ascii=False)